The difference you have with me (and Barry) may simply be a continental difference, so to speak. Among Jews I know, in the U.S., if you call yourself a Zionist, then that means that you're inclined to agree with whatever the Israeli government does. If you don't, then you're non-Zionist or anti-Zionist.
Of course, the most awful Zionists in the U.S. are Christians United For Israel (CUFI) and similar groups. (Jews are wonderful, you see, as long as they're Over There for when Jesus comes back and tells them they must convert or they'll be left behind after The Rapture...)
In any case, like Barry, I don't have a problem talking about the continuing "colonial project at the heart of Zionism" and such. You and others in the AWL seem to want to eschew this. If it's because antisemitism is a bigger problem in the UK than the U.S. then I understand. But I don't see how one can discuss Zionism *as an ideology* without bringing this up.
So while many UK Jews who oppose the colonialism and brutality of the Israeli state many think of themselves as Zionists, they probably really aren't.